package com.atguigu.lease.web.admin.service.impl;

import com.atguigu.lease.common.constants.RedisConstant;
import com.atguigu.lease.common.exceptions.LeaseException;
import com.atguigu.lease.common.result.ResultCodeEnum;
import com.atguigu.lease.common.utils.JwtUtil;
import com.atguigu.lease.model.entity.SystemUser;
import com.atguigu.lease.model.enums.BaseStatus;
import com.atguigu.lease.web.admin.service.LoginService;
import com.atguigu.lease.web.admin.service.SystemUserService;
import com.atguigu.lease.web.admin.vo.login.CaptchaVo;
import com.atguigu.lease.web.admin.vo.login.LoginVo;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.wf.captcha.SpecCaptcha;
import com.wf.captcha.base.Captcha;
import io.netty.util.internal.ObjectUtil;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.lang3.ObjectUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

import java.util.UUID;
import java.util.concurrent.TimeUnit;

@Service
public class LoginServiceImpl implements LoginService {
    @Autowired
    private RedisTemplate<String, Object> redisTemplate;
    @Autowired
    private SystemUserService systemUserService;

    @Override
    public CaptchaVo customGetCaptcha() {
        SpecCaptcha specCaptcha = new SpecCaptcha(130, 48, 4);  //长,高,位数
        specCaptcha.setCharType(Captcha.TYPE_DEFAULT);  //验证码类型--默认类型=> 包含字母和数字

        /**
         * code 和 key 一起传到 redis 库中, 临时保存.
         * key 在和 image 一起去返回前端 .
         */
        String code = specCaptcha.text().toLowerCase();
        String key = RedisConstant.ADMIN_LOGIN_PREFIX + UUID.randomUUID().toString();
        String image = specCaptcha.toBase64();

//        RedisTemplate redisTemplate = new RedisTemplate<>();
        //用 redis序列化器 实例将键值对加入到 redis 数据库中
        redisTemplate.opsForValue().set(key,code, RedisConstant.ADMIN_LOGIN_CAPTCHA_TTL_SEC, TimeUnit.SECONDS);
        CaptchaVo captchaVo = new CaptchaVo(key, image);    //返回 Vo 实例
        return captchaVo;
    }

    @Override
    public String login(LoginVo loginVo) {
        //1. 检验接收的验证码是否为null,不为null继续
        if (ObjectUtils.isEmpty(loginVo.getCaptchaCode())){
            throw new LeaseException(ResultCodeEnum.ADMIN_CAPTCHA_CODE_NOT_FOUND);
        }
        //2. 根据key判定redis的验证码是否过期
        String redisCode = (String) redisTemplate.opsForValue().get(loginVo.getCaptchaKey());   //根据请求的key在redis中查找value.
        if (ObjectUtils.isEmpty(redisCode)){
            throw new LeaseException(ResultCodeEnum.ADMIN_CAPTCHA_CODE_EXPIRED);
        }
        //3. 进行验证码对比，相等继续
        String captchaCode = loginVo.getCaptchaCode();  //前端传过来的code
        if (!captchaCode.equalsIgnoreCase(redisCode)){
            throw new LeaseException(ResultCodeEnum.ADMIN_CAPTCHA_CODE_ERROR);
        }
        //4. 根据账号进行数据查询，检查账号是否存在
        LambdaQueryWrapper<SystemUser> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(SystemUser::getUsername, loginVo.getUsername());
        SystemUser systemUser = systemUserService.getOne(wrapper);
        if (ObjectUtils.isEmpty(systemUser)){
            throw new LeaseException(ResultCodeEnum.ADMIN_ACCOUNT_NOT_EXIST_ERROR);
        }
        //5. 对比密码（密码加密处理）
        String cPassword = loginVo.getPassword();   //前端传过来的, 未加密的密码
        String mysqlPassword = systemUser.getPassword();    //数据库中的,加密后的密码
        if (!DigestUtils.md5Hex(cPassword).equals(mysqlPassword)){
            throw new LeaseException(ResultCodeEnum.ADMIN_ACCOUNT_ERROR);
        }
        //6. 检查账号是否被禁用
        if (systemUser.getStatus().equals(BaseStatus.DISABLE)){
            throw new LeaseException(ResultCodeEnum.ADMIN_ACCOUNT_DISABLED_ERROR);
        }
        //7. jwtutils生成token返回即可
        String token = JwtUtil.createToken(systemUser.getId(), systemUser.getUsername());
        return token;
    }
}
